Finding the Fourth Proportional to 128,766.36, 192,900.45 and 72,435.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,766.36 : 192,900.45 = 72,435.30 : x
2. Step 2: Convert to fraction form
   128,766.36/192,900.45 = 72,435.30/x
3. Step 3: Cross multiply
   128,766.36x = 192,900.45 × 72,435.30
4. Step 4: Simplify right side
   128,766.36x = 13,972,801,965.89
5. Step 5: Solve for x
   x = 13,972,801,965.89/128,766.36
6. Step 6: Final answer
   x = 108,512.83